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Acquisition of PEG Partners, LLC - Schedule of Fair Value of Assets Acquired, Liabilities Assumed and Non Controlling Interests (Detail) - USD ($)
$ in Thousands
12 Months Ended
Feb. 28, 2017
Dec. 31, 2017
Acquisition Date [Line Items]    
Bargain purchase gain   $ 27,067
PEG Partners LLC [Member]    
Acquisition Date [Line Items]    
Cash $ 969  
Accounts receivable 1,584  
Other current assets 500  
Property, plant and equipment 24,122  
Liabilities assumed (12,454)  
Non-controllinginterest (1,595)  
Net assets acquired 13,126  
Consideration transferred 0  
Bargain purchase gain $ 13,126